AD7866 Analog Devices, AD7866 Datasheet - Page 10

• Manufacturer Part Number: AD7866
• Description: Dual 1MSPS, 12-Bit, 2-Channel SAR ADC with Serial Interface
• Manufacturer: Analog Devices

Specifications of AD7866

• Resolution (bits): 12bit
• # Chan: 4
• Sample Rate: 1MSPS
• Interface: Ser,SPI
• Analog Input Type: SE-Uni
• Ain Range: Uni (Vref),Uni (Vref) x 2,Uni 2.5V,Uni 5.0V
• Adc Architecture: SAR
• Pkg Type: SOP

AD7866
TPC 4a. PSRR vs. Supply Ripple Frequency,
with Supply Decoupling
TPC 4b. PSRR vs. Supply Ripple Frequency,
with Supply Decoupling
–100
–100
–10
–20
–30
–40
–50
–60
–70
–80
–90
–0.2
–0.4
–0.6
–0.8
–1.0
–10
–20
–30
–40
–50
–60
–70
–80
–90
1.0
0.8
0.6
0.4
0.2
0
0
0
1k
1k
0
V
100mV p-p SINE WAVE ON AV
2.5V EXT REFERENCE ON V
T
V
100mV p-p SINE WAVE ON AV
2.5V EXT REFERENCE ON D
DD
T
V
A
DD
A
DD
V
= 25 C
= 3.6V
= 25 C
DD
= 2.7V
= 4.75V
500
= 2.7V
V
1000
TPC 5. DC DNL Plot
DD
AV
AV
= 3.6V
DD
10k
DD
10k
RIPPLE FREQUENCY – Hz
1500
RIPPLE FREQUENCY – Hz
ADC – Code
2000
REF
CAP
DD
DD
A, D
2500
CAP
100k
100k
B
3000
3500
4000
1M
1M
–10–
–60
–65
–70
–75
–80
–85
–90
–70
–72
–74
–76
–78
–80
–82
–84
–86
–88
–90
–0.2
–0.4
–0.6
–0.8
–1.0
10k
1.0
0.8
0.6
0.4
0.2
0.0
TPC 7. THD vs. Analog Input Frequency
for Various Source Impedances
10k
TPC 8. THD vs. Analog Input Frequency
for Various Supply Voltages
0
T
V
V
A
DD
DD
T
= 25 C
A
= 4.75V
= V
= 25 C
500
DRIVE
1000
= 4.75V
TPC 6. DC INL Plot
INPUT FREQUENCY – Hz
INPUT FREQUENCY – Hz
1500
V
DD
ADC – Code
100k
100k
2000
= V
V
DD
DRIVE
V
DD
= V
2500
= V
= 3.6V
DRIVE
DRIVE
3000
= 2.7V
= 5.25V
R
R
IN
R
IN
IN
= 100
= 10
3500
= 50
1000k
1000k
4000
REV. A